Device for mixing, sifting, and kneading



May 9, 1939* l P VOLLRATH 2,157,683

DEVICE FOR MIXING. SIFTING, AND KNEADING Filed Dec. 20, 1937 3Sheets-Sheet 1 fr, il

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May 9, 1939. P. VOLLRATH 2,157,683

DEVICE FR MIXING. SIFTING, AND KNEADING May 9, 1939.

P. VOLLRATH DEVICE FOR MIXING, SIFTING, AND KNEADING Filed Dec. 20, 1937lll!!I mul ummm 5 Sheets-Sheet 3 Patented May 9, 1939 PATENT. OFFICE-DEVICE Foa MIXING, SI'FTING, AND i KNEAnmG Paul Vollrath,Cologne-Ehrenfeld, Germany ApplicationrDecember 20, 1937, SerialNo.180,699

In Germany December 24, 1936 1 Claim.

For the` correct treatment of liquid, semiuid, pasty and also powderymaterials mixing, kneading and sifting machines are used according tothe class lof material and the necessarytreatment thereof. In the caseof certain materials, for instance dyestuifs, the treatment isfrequently carried out by means of machines of all the three kindsreferred to. In other words, as long as the mass is'pasty,l it iskneaded, then after liquids have been added, so as to render it morefluid, it is further treated by means of mixing and sifting devices.

. It is the object of the present invention to provide for a devicewhich may optionally be .used for mixing, siftingr and kneading so thatthe purchase of three different machines may be dispensed with, chieflyin the case of small factories. The essential feature of the inventionconsists in that above a stationary or movable trough there is arrangeda driving shaft adjustable in a vertical direction and with which mayoptionally be coupled a mixing device or a rotary` sieve or, through theintermediary of a reduction gear, a kneading device. In this way thepossibility of utilization of the ymachine is extremely increasedwhereas the expenses for purchase and operation are naturally reduced.

The subject matter of the present invention Fig. 6 is a horizontalsection on line 6--6,

Fig.'5.

A frame l displaceable in a vertical direction on two vertical rails 8mounted on a vertical base, Il and balanced by a counterweight 9fcarries` the driving motor I0, preferably an elec-` tric motor. Bymembers not shown the frame 'l may be xed in any position desired.

The driving shaft II of the electric motor extends in a verticaldirection and at its bottom end carries a universal'coupli-ng I2 bymeans of which optionally either the shaft I4 of aI mixing device of anydescription or the shaft I6 of a sifting device I5 to be described maybe coupled thereto. According to the invention the base I1 for frame lis provided with a gear box I8 pivotally 'mounted thereon by means of avertical axle I9 and which, as Fig. 3'shows, may be turned from thedotted into the full lineposi- `5 tion so as to be positioned beneaththe motor' I and locked in that position to the base I1 e. g. by a pin20. The gear lodged in the box I8 has a trunnion shaft 2| extendingthrough the top of' the box and a trunnion shaft 22' extending throughythe bottom thereof which trunnion shafts are so disposed that the upperone 2I can be coupled with the shaft II of the motor and the lower one22 with the shaft 23 of a kneading device. No matter whether it is thequestion of a planetary gear or any other suitablegear, the principalpurpose thereof is to reduce `the comparatively high speed of the motor.When at the same time the reduction gear is so designed that it alsoimparts a bodily circular movement to the kneading device around thecentral axis of trough 24 the eflciency ofthe device will be furtherincreased.

The trough 24, Iin which the devices I3, I or 23 may work as desired, iseither stationary or movable and arranged beneath the driving motor.

The siftingA device I5 comprises an annular portion 25 which is fastenedby spokes 21 to the hub 26. The cross section of the spokes 2l is so:shaped that the latter are adapted to act xlike turbine blades and tothus draw the liquid material into the sifting device. The annular bodycarriesa plurality of sievebaskets, e. g. three, 28, 29, 30, one nestedinto the other and suspended from the body the size of the meshes of thebaskets decreasing from the-center in' an outward direction. The outsidesieve is provided wth radial outside ribs 3I while the hub 26 carries ablade cross 32 dependingtherefrom'. The several sieve baskets mayreadily be removed and 4replaced by other Ysieves and with meshes ofanother size in accordance with the material to be treated therein.'LI'he propeller-like shape of the spokes 21, as shown in dotted linesin Fig.\ 5, will result in an intense circulation of the material beingtreated which is urged to pass through the several sieves whilethe bladecross 32 will direct the stream of liquid substantially flowing from thetop downwardly, toward the .surfaces of the sieves.

in the corners 33 as shown, while the other por- 55 tions of the sievesremain free so that cleansing thereof is rendered necessary but uponextended use. In order that the velocity of flow be increased and thepressure of the liquid as prevailing outside the sieves be reduced, theoutside sieve basket is, as mentioned, provided with ribs v3| which atthesame time render the body of the sieve more rigid. By the cooperationof theblade cross 32 with the ribs 3| there is produced apressure aboveatmospheric within the sieves and a pressure below atmospheric on theoutside thereof which fact increases the e.

ciency of the unit.

Although the drive as accomplished by an electric motor is, particularlysimple and practical the invention is however not limited to this as anyother driving device may be made use of without departing from the scopeof the present invention.

What I claim as my invention and desire to ranged to attach differenttreating tools for the material to said shaft, and a reduction geardrive pivotally supported on said support laterally of said drivingshaft and disposed to swing into position for coupling its power inputshaft with said driving shaft coupling, said reduction gear havingsuitable moans at its output shaft for coupling the desired operatingtool with it.

PAUL VOLLRATH. 20

